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Auto flammability

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Reference
Endpoint:
self-ignition of dust accumulation
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2003-01-14
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
other: company guideline
Principles of method if other than guideline:
Deposited dust: This test determines the ignition temperature of a dry product on a hot surface. For a description of the method see "any other information on materials and methods".
GLP compliance:
no
Key result
Self-ignition temperature:
> 240 °C
Remarks on result:
other: slow decomposition occured
Conclusions:
Melting of test substance observed from 240 °C on with slight hissing noise, foaming and smoke development (increases with increasing temperature). Thus, thiourea was categorized in BWZ 1.
Executive summary:

The test determines the ignition temperature of a deposited dusty test substance on hot surfaces. The test is conducted according to the test protocol. The surface area of the substance is increased intentionally in this test by preparing the test substance accordingly to simulate the deposited dusty properties. The ignition temperature of deposited dusty test material is expected to be lower than the ignition temperature of the solid with larger particle diameters.

Melting of the test substance was observed from 240 °C on with slight hissing noise, foaming and smoke development (increases with increasing temperature). Thus, thiourea was categorized in BWZ 1 of 6.

Description of key information

Thiourea is non-autofammable.

Key value for chemical safety assessment

Additional information

The test determines the ignition temperature of a deposited dusty test substance on hot surfaces. The test is conducted according to the test protocol. The surface area of the substance is increased intentionally in this test by preparing the test substance accordingly to simulate the deposited dusty properties. The ignition temperature of deposited dusty test material is expected to be lower than the ignition temperature of the solid with larger particle diameters.

Melting of the test substance was observed from 240 °C on with slight hissing noise, foaming and smoke development (increases with increasing temperature). Thus, thiourea was categorized in BWZ 1.

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